Switching power supply, and method and circuit for regulating output of the same
AssigneeTDK Corporation
InventorsTakakazu Imai, Takeshi Uematsu, Hiroshi Kawasaki, Koichiro Miura, Ken Matsuura
Life of this patent
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Abstract
An output voltage of a switching power supply is regulated to a target value. When the target value of the output voltage is altered, the reference value is changed monotonously and linearly a plurality of times at a plurality of gradients to the altered target value. An input voltage of the power supply is switched in response to a switching pulse with the duty ratio calculated according to a difference between the reference value and the output voltage.
Claims11
A method for regulating an output voltage of a switching power supply to a target value, comprising:
- calculating a reference value;
- calculating a duty ratio according to a difference between the reference value and the output voltage so as to reduce the difference;
- generating a switching pulse having the calculated duty ratio;
- and
- switching an input voltage of the switching power supply in response to the generated switching pulse,
- wherein calculating the reference value includes, when the target value of the output voltage is altered, monotonously and linearly changing the reference value a plurality of times at a plurality of gradients to the altered target value.
An output control circuit for regulating an output voltage of a switching power supply to a target value, the switching power supply switching an input voltage in response to a switching pulse, comprising:
- a reference calculator circuit for calculating a reference value;
- a circuit for calculating a duty ratio corresponding to a difference between the reference value and the output voltage so as to reduce the difference;
- and
- a generator circuit for generating the switching pulse having the duty ratio,
- wherein, when the target value of the output voltage is altered, the reference calculator circuit monotonously and linearly changes the reference value a plurality of times at a plurality of gradients to the altered target value.
Dependencies are inferred from the claim text.